64644631 has 12 divisors (see below), whose sum is σ = 68558664. Its totient is φ = 60944400.

The previous prime is 64644617. The next prime is 64644637. The reversal of 64644631 is 13644646.

It is not a de Polignac number, because 64644631 - 2⁹ = 64644119 is a prime.

It is a super-2 number, since 2×64644631² = 8357856634252322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64644637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119221 + ... + 119761.

It is an arithmetic number, because the mean of its divisors is an integer number (5713222).

Almost surely, 2^64644631 is an apocalyptic number.

64644631 is a deficient number, since it is larger than the sum of its proper divisors (3914033).

64644631 is a wasteful number, since it uses less digits than its factorization.

64644631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910 (or 891 counting only the distinct ones).

The product of its digits is 41472, while the sum is 34.

The square root of 64644631 is about 8040.1884928153. The cubic root of 64644631 is about 401.3384973165.

The spelling of 64644631 in words is "sixty-four million, six hundred forty-four thousand, six hundred thirty-one".